COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3481

                                             Konkoly Observatory
                                             Budapest
                                             14 June 1990

                                             HU ISSN 0374 - 0676


       PHOTOMETRY OF THE NEW ECLIPSING BINARY DHK 14 = HD 31679

   Kaiser (1990) discovered eclipses of the 8th-magnitude star BD +24d719 =
HD 31679 = SAO 76863, which was designated DHK 14 in his discovery list. The
spectral class is B5, the position is RA 4h 55m 50s, Dec. 24d 25' 14" (1950).
   Following discovery, Williams and Wood obtained photoelectric observations
in the V band on several nights and found continuous variation. A discrete
Fourier transform analysis by Kaiser shoved a likely period of 0.69 days, which
proved to be the half-period of a Beta Lyrae-type eclipsing binary (Figure 1).
   Neither observer was able to obtain a continuous series of observations with
sufficient phase coverage to determine a time of mid-eclipse. However, Williams
observed a portion of the descending branch of a primary minimum and Wood
observed much of the ascending branch on the same night. The time of minimum
determined by combining these observations, HJD 2447942.655, and the time 
of the
discovery photo, HJD 2447151.652, were used to refine the period. Preliminary
light elements are:

             Min. I = HJD 2447942.655 + 1.38529d E                 (1)

   The comparison star was 98 Tau. Based on its magnitude, 5.81 V, 0.00 B-V,
in the Bright Star Catalogue (Hoffleit and Jaschek 1982), the variable is
7.95 V, +0.34 B-V, at the maxima. The depths of the two minima remain somewhat
uncertain, but the secondary eclipse is close to 0.28m and the primary eclipse
may be 0.45m-0.50m.


                              [FIGURE 1]

 Figure 1. DHK 14, V-band differential photometry by Williams (28-cm
 Schmidt-Cassegrain) and Wood (25-cm Schmidt-Cassegrain); both used
 Optec SSP-3 photometers. The phases are calculated according to Equation 1.


   Some of the information in this report was obtained from SIMBAD, data
retrieval system of the Strassbourg, France, Astronomical Data Center, for
which we thank Joyce Rey-Watson of the Harvard-Smithsonian Center for
Astrophysics and Elizabeth Waagen of the AAVSO staff.


DAVID B. WILLIAMS         JAMES E. WOOD            DANIEL H. KAISER
9270-A Racquetball Way    11732 Faun Lane          2631 Washington Street
Indianapolis, IN 46260    Garden Grove, CA 92641   Columbus, IN 47201
USA                       USA                      USA


REFERENCES
Hoffleit, D., and Jaschek, C., 1982, The Bright Star Catalogue, Yale University
  Observatory, New Haven. [BIBCODE 1982bscf.book.....H ]
Kaiser, D. H., 1990, Inform. Bull. Var. Stars No. 3480.